Problem

A piece of wire has a resistance $R$ . It is cut …

01:23

Problem 75 Hard Difficulty

A toaster using a Nichrome TM heating element operates on 120 $\mathrm{V} .$ When it is switched on at $20^{\circ} \mathrm{C},$ the heating element carries an initial current of 1.35 A. A few seconds later, the current reaches the steady value of 1.23 $\mathrm{A}$ . (a) What is the final temperature of the element? The average value of the temperature coefficient of resistivity for Nichrome TM over the temperature range from $20^{\circ} \mathrm{C}$ to the final temperature of the element is $4.5 \times 10^{-4}\left(\mathrm{C}^{\circ}\right)^{-1} .$ (b) What is the power dissipated in the heating element (i) initially; (ii) when the current reaches a steady value?

Answer

a. The final temperature $(T)=237^{\circ} \mathrm{C}$
b. 148 $\mathrm{W}$

Related Courses

Physics 102 Electricity and Magnetism

College Physics

Chapter 19

Current, Resistance, and Direct-Current Circuit

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Video Transcript

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